[Adopted 5-4-1992 by Ord. No. 92-1]
Words and phrases used in this Part 1 shall be presumed to be used in their ordinary context unless such word or phrase is defined or interpreted differently within this section.
BOROUGH
The Borough Council or staff of Jefferson Borough.
CISTERN
A reservoir or tank for storing water.
CULVERT
A structure intended to convey runoff under an embankment, and which is designed to take advantage of submergence to increase capacity.
DESIGN STORM
The magnitude of precipitation from a storm event measured in probability of occurrence (e.g., fifty-year storm) and duration (e.g., 24 hours), and used in computing stormwater management control systems.
DETENTION BASIN
A basin designed to retard stormwater runoff by temporarily storing the runoff and releasing it at a predetermined rate. This basin is designed to drain completely after a storm event.
DEVELOPMENT
The improvement or alteration of any lot, parcel, tract or piece of land for residential, commercial, or industrial purposes in any manner which increases the quantity of impervious material cover, such as the construction or expansion of buildings, parking facilities, streets, etc.
IMPERVIOUS MATERIAL
Any material other than vegetative cover.
INFILTRATION STRUCTURES
A structure designed to direct runoff into the ground, e.g., seepage pits, seepage trenches, etc.
LAND DEVELOPMENT
Any subdivision or new construction or expansion of any residential, commercial, industrial, accessory or other facility that creates an additional area of impervious material on the parcel of 700 square feet or more.
PEAK DISCHARGE
The maximum rate of flow of water at a given point and time resulting from a predetermined storm.
PERSON
An individual, partnership, public or private association or corporation, firm, trust, estate, municipality, governmental unit, public utility or any other legal entity whatsoever. Whenever used in any section prescribing or imposing a penalty, the term "person" shall include the members of a partnership, the officers, agents and servants of a corporation and the officers of a municipality.
RETENTION BASIN
A basin or pond containing a permanent pool of water and designed to retard stormwater runoff by temporarily storing the runoff and releasing it at a predetermined rate.
RUNOFF
That part of precipitation which flows over the land.
RUNOFF CHARACTERISTICS
The surface components on any watershed which, either individually or in any combination thereof, directly affect the rate, amount and direction of stormwater runoff. These may include, but are not limited to, vegetation, soils, slopes and any type of man-made landscape alterations.
SCS
Soil Conservation Service, U.S. Department of Agriculture.
SEEPAGE PIT/SEEPAGE TRENCH
An area of excavated earth filled with loose stone or similar material and into which surface water is directed for infiltration into the ground.
STORMWATER
Drainage runoff from the surface of the land resulting from precipitation or snow or ice melt.
SUBDIVISION
Same definition as that contained in the current Jefferson Borough Subdivision and Land Development Ordinance.[1]
TIME OF CONCENTRATION
The interval of time required for water from the most remote portion of the drainage area to reach the point in question.
WATERSHEDS
Jefferson Borough Watershed Districts, as shown on a map attached hereto and made a part hereof.[2]
[1]
Editor's Note: See Ch. 158, Subdivision and Land Development.
[2]
Editor's Note: The Watershed District Map is on file in the Borough offices.
A. 
Any person engaged in the subdivision, alteration or development of land which may affect stormwater runoff characteristics in the watershed shall implement such measures as are reasonably necessary to prevent injury to health, safety or other property. Such measures shall include such actions as are required:
(1) 
To collect stormwater runoff from streets and other areas and convey same, as hereinafter provided, to a suitable point or points of discharge;
(2) 
To assure that the maximum rate of stormwater runoff is no greater after development than prior to development activities; and
(3) 
To manage the quantity, velocity and direction of resulting stormwater runoff in a manner which otherwise adequately protects health and property from possible injury. Said measures shall be in accordance with the criteria hereinafter provided. Such measures may include, but are not limited to, the following:
(a) 
Detention basins.
(b) 
Retention basins.
(c) 
Rooftop storage.
(d) 
Parking lot and street ponding.
(e) 
Seepage pits, seepage trenches or other infiltration structures.
(f) 
Porous pavement and concrete lattice block surfaces.
(g) 
Grassed channels and vegetated strips.
(h) 
Cisterns and underground reservoirs.
(i) 
Routing flow over grass.
(j) 
Decreased impervious area coverage.
B. 
The use of other control methods which meet the criteria in this section will be permitted when approved by the Jefferson Borough Engineer and the Borough Council. Various combination of methods may be tailored to suit the particular requirements of the type of development and the topographic features of the project area.
The following persons shall be exempted from the requirements of this Part 1:
A. 
Any person who has secured a building permit prior to the effective date of this Part 1.
B. 
Any person who applies for a building permit for a single-family dwelling within a subdivision, which subdivision was approved by the Borough Council after the effective date of this Part 1, subject to such conditions as may have been attached to said plan at the time of approval.
C. 
Construction of sidewalks, driveways and curbing within public rights-of-way existing and actually improved on the effective date of this Part 1.
D. 
Use of land for gardening for home consumption.
E. 
Agriculture, when operated in accordance with a conservation plan approved by the York County Conservation District.
Before the development of any tract, parcel or piece of land within the Borough, each person desiring to develop said land shall submit a stormwater management plan, to be approved by the Borough, which will provide for the management of stormwater on the land proposed for development. Said plan shall be submitted at the same time as the subdivision or land development plan, if a subdivision or land development plan is required to be submitted pursuant to the Jefferson Borough Subdivision and Land Development Ordinance.[1]
[1]
Editor's Note: See Ch. 158, Subdivision and Land Development.
The plan shall be sealed by a professional engineer or a professional surveyor. The engineer or surveyor shall certify that the plan meets the minimum design requirements of this Part 1 and shall include the following:
A. 
Topographic features.
(1) 
The location of the project relative to highways, municipalities or other identifiable landmarks.
(2) 
Contours at intervals of one foot. In areas of steep slopes (greater than 15%), five-foot contour intervals may be used.
(3) 
Streams, lakes, ponds or other bodies of water within or near the project.
(4) 
Other physical features, including existing drainage swales and areas of natural vegetation to be preserved.
(5) 
Locations of proposed underground utilities, sewers, and waterlines.
B. 
Soil series and boundaries within the area tributary site.
C. 
Final topography.
(1) 
Changes to land surface and vegetative cover.
(2) 
Areas to be cut or filled.
(3) 
Structures, roads, paved areas and buildings.
(4) 
Final contours at intervals of one foot. In areas of steep slopes (greater than 15%), five-foot contour intervals may be used. Final contours in area of stormwater management facilities may not exceed two-foot intervals.
D. 
Stormwater management controls.
(1) 
All stormwater management controls must be shown on the plan and described, including:
(a) 
Groundwater recharge methods, such as seepage pits, beds or trenches. The location of the proposed structure, including a detailed cross section. If these structures are proposed, the locations of septic tank infiltration areas and wells must be shown. Groundwater recharge methods must comply with the additional requirements in Subsection F of this section.
(b) 
Other control devices, such as rooftop storage, semipervious paving materials, grass swales, parking lot ponding, vegetated strips, detention or retention ponds, storm sewers, etc.
(c) 
Basins. A cross section of the basin showing the relationship between the existing topography and the proposed bottom, spillway, top of embankment and the outlet structure and the corresponding proposed finished grade elevations. A detail of the outlet structure shall be provided, including all pertinent construction requirements.
(d) 
Schedule for installation of the control measures and devices. In all cases, the proposed stormwater control devices must be completed prior to the creation of additional impervious area.
(2) 
All calculations, assumptions and criteria used in the design of the control device or method must be submitted with the plan, including, but not limited to: methodology for determining time of concentration and weighted runoff curve numbers; stage/storage/discharge table, including sample calculations for determining discharge rates; summary table showing predevelopment, controlled and uncontrolled post-development peak discharge rates for all required storms; and copies of percolation test results when required.
E. 
Stormwater collection system.
(1) 
All catch basins, pipes, swales, and other means of conveyance of stormwater must be shown and described, including:
(a) 
A plan view of the collection system showing the location, size and material for all catch basins, ditches, swales and pipes.
(b) 
A profile of the collection system showing existing and proposed finish grades, proposed invert elevations and slope of each storm sewer or open channel segment.
(c) 
A topographic plan showing the area tributary to each design point in the collection system.
(2) 
All calculations, assumptions, and criteria used in the design of the stormwater collection system must be submitted with the plans.
F. 
Additional requirements for groundwater recharge methods. The following requirements apply to all proposed groundwater recharge methods of stormwater management, such as seepage pits, beds, trenches, leaching wells and cisterns:
(1) 
Representative percolation tests must be made throughout the area proposed for development. At least one percolation test must be included in each soil series group, and at least one percolation test must be conducted for each five lots proposed for development.
(2) 
Seepage pits, beds, or trenches shall not be permitted for any development of more than five lots, without prior approval of the Borough Council.
G. 
Maintenance program. A maintenance program for all stormwater management facilities must be included. This program must include the ownership of the facilities and detail the financial responsibility for any required maintenance and shall comply with the requirements of § 144-11 of this Part 1.
The stormwater collection system shall be designed and approved based upon the following criteria:
A. 
General. Peak discharge shall be computed using the rational formula:
Q = CIA
Where:
Q =
Peak discharge in cubic feet per second
C =
Runoff factor expressed as a percent of the total water falling on an area
I =
The rate of rainfall for the time of concentration of the drainage area in inches per hour for a given storm frequency (rainfall intensity)
A =
The drainage area expressed in acres
The runoff factor "C" is a percentage factor which represents the proportion of the total quantity of water falling on the area that remains as runoff.
The runoff factors for various types of drainage areas, as presented in Table 1, shall be used for design.[1]
A computation table similar to Table 2 shall be submitted with the storm sewer design.[2]
Storm intensity-duration-frequency curves are presented on Figure 1.[3] The curves provide for variation in rainfall intensity according to:
(1) 
Storm frequency.
(a) 
The following storm frequencies shall be used for design:
[1] 
Local streets: 10 years.
[2] 
Culvert cross drains: 25 years.
[3] 
Swales: 100 years.
(b) 
When a pipe or culvert is intended to convey the discharge from a stormwater management facility, its required capacity shall be computed by the rational method and compared to the peak outflow from the stormwater management facility for the fifty-year storm. The greater flow shall govern the design of the pipe or culvert.
(c) 
When a pipe is part of a storm sewer system and crosses the roadway, it shall be designed as a storm sewer with the same design storm as the remainder of the drainage system.
(d) 
Greater design frequencies may be justified on individual projects.
(e) 
A fifty-year storm frequency may be required for design of the stormwater collection system to ensure that the resultant stormwater runoff from the post-development storm is directed into the management facility.
(2) 
Storm duration.
(a) 
The time-of-concentration approach shall be used in determining storm duration.
(b) 
A minimum duration of five minutes shall be used.
[1]
Editor's Note: Table 1 is included as an attachment to this chapter.
[2]
Editor's Note: Table 2 is included as an attachment to this chapter.
[3]
Editor's Note: Figure 1 is included as an attachment to this chapter.
B. 
Inlet placement.
(1) 
In general, inlets shall be spaced such that, based upon the rational method, tc = five minutes and ten-year rainfall intensity, the area contributing to the inlet shall not produce a peak runoff of greater than four cfs. Also, inlets shall be spaced so that their efficiency, based upon efficiency curves published by the Pennsylvania Department of Transportation, is not less than 65% (Figures 2 through 6).[4]
[4]
Editor's Note: Figures 2 through 6 are included as attachments to this chapter.
(2) 
Additional inlets shall be placed at the upper side of street intersections to prevent stormwater from crossing an intersection. Other devices such as high-efficiency grates or perforated pipe may be required if conditions warrant.
C. 
Pipe and swale capacity. Manning's Equation shall be used for the design of all storm sewer pipes and for open channel design:
Where:
V =
V = Velocity of the water in feet per second
R =
R = Hydraulic radius which is equal to the net effective area (A) divided by the wetted perimeter (W.P.):
  A  
R =
W.P.
The wetted perimeter is the linear feet of the drainage facility cross section which is wetted by the water.
S =
Slope of energy line (for approximation, use water surface slope in wetted stream and stream bed slope in dry stream).
n =
The roughness coefficient. Roughness coefficients are presented in Table 3.[5]
The maximum permitted velocity in an unlined swale shall be 5.0 feet per second.
[5]
Editor's Note: Table 3 is included as an attachment to this chapter.
D. 
Culverts. In all cases where drainage is picked up by means of a headwall, and inlet or outlet conditions control, the pipe shall be designed as a culvert. The minimum diameter of culvert shall be 18 inches. The procedure contained in Hydraulic Engineer Circulars No. 5 and No. 13, as prepared by the U.S. Department of Transportation, Federal Highway Administration, Washington, D.C., shall be used for the design of culverts.
The plan shall be designed and approved based upon the following criteria:
A. 
General. Peak discharge and runoff shall be computed using the soil-cover complex method contained in the "Urban Hydrology for Small Water Sheds," Technical Release No. 55, published by the Engineering Division, Soil Conservation Service, United States Department of Agriculture, dated January 1975, except as modified herein.
B. 
Outflow determination. The maximum permitted stormwater discharge, in cubic feet per second, from any site shall not exceed the capacity of the receiving pipe or structure, nor the calculated peak discharge from the site at predevelopment ground cover and soil conditions for all design storms specified below. For the purposes of this Part 1, predevelopment ground cover conditions shall be assumed to be "meadow," as defined in "Urban Hydrology for Small Water Sheds," Technical Release No. 55, published by the Engineering Division, Soil Conservation Service, United States Department of Agriculture, dated January 1975. The maximum permitted stormwater discharge shall be calculated using the SCS method for twenty-four-hour rainfalls having recurrence intervals of two, five, 10, 25 and 50 years. For the purposes of this Part 1, the following rainfall depths shall be used for design:
Recurrence Interval
(years)
24-Hour Rainfall Depth
(inches)
2
3.1
5
3.9
10
4.8
25
5.3
50
6.1
100
6.8
C. 
Existing runoff volume. Existing runoff volume, in inches, shall be determined using the SCS method at predevelopment conditions for the fifty-year rainfall depth listed in Subsection B herein.
D. 
Future runoff volume. The future runoff volume, in inches, shall be determined using the SCS method at post-development conditions (including any future expansion) for the fifty-year rainfall depth listed in Subsection B above.
E. 
Minimum required detention storage. The minimum required detention storage shall be determined by routing the post-development hydrograph through the stormwater management facility, using either manual methods or computerized routing. Routing shall be based upon the Modified Puls Method; other routing methodologies shall be subject to the approval of the Borough Engineer.
F. 
Emergency spillway. Emergency spillways or overflow structures shall be designed to pass the peak flow resulting from a one-hundred-year twenty-four-hour design storm computed at post-development conditions. All retention basins and detention basins shall be provided with an emergency spillway.
G. 
Minimum bottom slope. All detention basins shall have a minimum bottom slope of 2%, unless a paved low-flow channel is provided.
H. 
Maximum depth. The permitted depth for detention or retention basins shall be six feet, measured from the bottom of the emergency spillway to the lowest point in the basin.
I. 
Side slopes. The maximum permitted side slopes for detention or retention basins shall be four horizontal to one vertical.
J. 
Location. All stormwater management facilities are considered structures and must comply with building setback requirements.
K. 
Fencing. Any stormwater detention/retention facility that is designed so that it retains water on a temporary basis, located in or adjacent to a residential, agricultural or conservation zone, shall be subject to the following fencing requirements:
(1) 
Stormwater facility must be completely surrounded by a fence or wall of not less than four feet in height, which shall be so constructed as not to have openings, holes or gaps larger than two inches in any dimension (including the distance between horizontal or vertical pickets in a picket fence).
(2) 
All gates or doors opening through such enclosure shall be equipped with a self-closing and self-latching device for keeping the gate or door securely closed at all times.
A. 
The Borough shall forward one copy of the plan to the Borough Engineer for review. The Borough Engineer shall recommend to the Borough in writing whether the plan should be approved, disapproved or amended within 60 days following its submission. Failure of the Borough Engineer to render an opinion within the sixty-day time limit shall be deemed a favorable review unless the applicant has agreed in writing to an extension of time.
B. 
At a scheduled public meeting, the Borough Council shall render its decision on the application and communicate its decision to the applicant not later than 90 days after such application has been filed. The decision of the Borough Council concerning plan approval, disapproval or amendment shall be in writing and shall be communicated to the applicant personally or mailed to him at his last known address not later than five days following the decision.
Fees covering costs to the Borough for plan reviews, permit issuance, and inspections shall be established by resolution of the Borough Council. No permit to begin any work on the project shall be issued until the required fees have been paid.
A. 
The fees payable by an applicant shall, at a minimum, cover:
(1) 
The review of the stormwater management/erosion and sedimentation control plan.
(2) 
The site inspection.
B. 
In addition to the fees required in Subsections A(1) and (2) of this section, the applicant shall deposit with the Borough before a permit shall be issued, a sum set by resolution. The sum deposited by the applicant shall be used by the Borough to cover the following costs:
(1) 
The inspection of required controls and improvements during construction;
(2) 
The final inspection upon completion of the controls and improvements required in the plan; and
(3) 
Any additional work required to enforce the permit provisions, correct violations, and assure the completion of stipulated remedial actions.
C. 
Any additional costs incurred by the Borough in the administration of this Part 1 not paid by the applicant pursuant to Subsection B of this section shall be charged to the applicant and shall be paid promptly by the applicant. Upon completion of the construction of the stormwater management facility and upon final approval by the Borough Engineer, any moneys in excess of Township costs or expenses deposited by the applicant pursuant to Subsection B of this section shall be refunded to the applicant.
A. 
Where the applications of the standards and requirements of this Part 1 would result in unique and undue hardship to a particular person or particular site or where the Borough Engineer and Borough Council determine that the intent of this Part 1 would better be accomplished, the Borough may, in its sole discretion, require the payment of a fee in lieu of compliance with the provisions of this Part 1. In determining whether a fee may be imposed by the Borough in lieu of compliance with the provisions of this Part 1, the Borough shall consider, where relevant, the following criteria:
(1) 
The amount of impervious area to be added to the site;
(2) 
The relationship of such impervious areas to property lines;
(3) 
The area available for on-lot stormwater management facilities;
(4) 
The capacity and condition of receiving channels;
(5) 
The location of existing or proposed stormwater management facilities which would affect or be affected by development of the site; and
(6) 
Such other information as the person proposing development or the Borough may deem relevant.
B. 
Where it has been determined by the Borough that a fee may be paid in lieu of compliance with the provisions of this Part 1, the following procedures shall be followed:
(1) 
The amount of the fee, as established by resolution of the Borough Council, shall be for each square foot of impervious material to be added to the site.
(2) 
The fee must be paid to the Borough prior to issuance of any permits.
(3) 
All money paid to the Borough in this manner shall be kept in a capital reserve fund established as provided by law. Money in such capital reserve fund must be used only for the acquisition of land, construction of facilities, or maintenance of facilities for stormwater management purposes.
(4) 
Funds collected pursuant to this section shall be designated as collected from the watershed district in which the proposed development is to occur. Thereafter, moneys expended from the fund for stormwater management facilities in any one district may not exceed moneys collected from that district.
(5) 
The provisions of these regulations governing the setting and collection of fees in lieu of construction of facilities shall not be utilized until the Borough has established a capital reserve fund.
A. 
Performance bond.
(1) 
The Borough shall require a performance bond or letter of credit in favor of Jefferson Borough in an amount equal to 110% of the estimated cost of all stormwater management facilities. Said bond shall be conditioned upon the faithful performance of the control measures specified on the plan within the times specified or within any extension thereof granted by the Borough. Said bond shall terminate when all control measures as shown on the approved plan are completed and approved by the Borough Engineer.
(2) 
In lieu of the required bonds, the applicant may deposit funds or securities in an escrow account satisfactory to the Borough Solicitor. Funds deposited in this account for guaranteeing the construction or maintenance of control measures shall be used for these purposes only.
B. 
Maintenance guaranty.
(1) 
Maintenance by private entity. In cases where permanent control facilities are owned by a private entity (such as a homeowners' association), such entity shall be responsible for maintenance. In this case a legally binding agreement between the entity and the municipality shall be made, providing for maintenance of all permanent control facilities, including the inspection by the Borough of all such facilities deemed critical to the public welfare annually and after each major flood event.
(2) 
Maintenance by individual lot owners.
(a) 
When stormwater management facilities are located on all individual lots, and when they are the responsibility of that landowner to maintain, a description of the facility or system and the terms of the required maintenance shall be recorded with the deed to the property.
(b) 
If the Borough determines at any time that any permanent stormwater management facility has been eliminated, altered or improperly maintained, the owner of the property shall be advised of corrective measures required and given a reasonable period of time to take necessary action. If such action is not taken by the property owner, the Borough may cause the work to be done and a lien for costs may be placed against the property in accordance with the requirements of the Municipal Lien Law.[1]
[1]
Editor's Note: See the Municipal Claim and Tax Lien Law, Act 153 of 1923, P.L. 207; 53 P.S. § 7101.
(3) 
Maintenance by Borough. The Borough is authorized, where it is deemed necessary for the public welfare, to enter into contracts with persons whereby such persons will dedicate such stormwater management facilities to the Borough; provided, however, that before such stormwater management facility is dedicated to the Borough and accepted by the Borough such person shall have deposited a sum of money with the Borough sufficient, in the opinion of the Borough, to provide for the future maintenance and repair of the stormwater management facility for a period of not less than 10 years.
A. 
The Borough Engineer or his designee shall periodically inspect the site during construction of the permanent stormwater facilities. It is the responsibility of the permittee to notify the Borough Engineer 48 hours in advance of the beginning of construction of stormwater management facilities.
B. 
Any portion of the work which does not comply with the approved plan must be promptly corrected by the permittee. No work may proceed on any subsequent phase of the stormwater management plan, the subdivision or land development or building construction until the required corrections have been made.
C. 
After construction of the facility, the developer's engineer or surveyor will certify to the Borough that the construction of the stormwater management facility was completed in accordance with the plans and specifications as originally submitted and approved by the Borough. Plans which are not properly documented and certified or which do not accurately reflect correct site corrections will be rejected.
Any development activity conducted in violation of the provision of this Part 1 is hereby declared to be a public nuisance. Suits to restrain, prevent or abate violation of this Part 1 may be instituted in equity or at law by the Borough or by an aggrieved person.
[Amended 2-2-2009 by Ord. No. 2009-01]
Any person violating any of the terms or provisions of this Part 1 shall be fined in a sum not exceeding $1,000 following conviction in summary proceedings commenced by the Borough before any District Magisterial Judge. Each day's violation shall constitute a separate offense for the purpose of commencing summary proceedings. Upon judgment against any person by summary conviction, or by proceedings by summons or default of the fine imposed and costs, said person may be sentenced to the York County jail for a period not exceeding 30 days.
Any person aggrieved by any decision of the Borough may appeal to the Court of Common Pleas of York County, Pennsylvania, within the time allowed by law for such an appeal.
The provisions of these regulations are intended as a minimum standard for the protection of the public health, safety and welfare. If the literal compliance with any mandatory provision of these regulations is shown by the applicant, to the satisfaction of the Borough Engineer and the Borough Council, to be unreasonable or to cause undue hardship as it applies to a particular property, or if the applicant shows that an alternative proposal will allow for equal or better results, the Borough Council may grant a waiver from such mandatory provision. However, the granting of a waiver shall not have the effect of making null and void the intent and purpose of this Part 1. In granting waivers, the Borough Council may impose such conditions as will, in its judgment, secure substantially the objectives of the standards and requirements of this Part 1.
This Part 1 is enacted by Jefferson Borough pursuant to authority vested in boroughs by the Borough Code, §§ 45101 through 48501; the terms and provisions of the Pennsylvania Municipalities Planning Code, 53 P.S. §§ 10101 through  11202, and to carry out the express intent of the Legislature of the Commonwealth of Pennsylvania as set forth in the Stormwater Management Act, No. 1978-167, 32 P.S. §§ 680.1 through 680.17, approved October 4, 1978.